Agent SDK reference - Python changedagent-sdk/python
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28422842**Tool name:** `TodoWrite`
28432843
28442844<Note>
2845 As of Claude Code v2.1.142, `TodoWrite` is disabled by default. Use `TaskCreate`, `TaskGet`, `TaskUpdate`, and `TaskList` instead. See [Migrate to Task tools](/docs/en/agent-sdk/todo-tracking#migrate-to-task-tools) to update your monitoring code, or set `CLAUDE_CODE_ENABLE_TASKS=0` to revert to `TodoWrite`.
2845 On Python Agent SDK 0.2.139 and later, the following tools aren't available on Opus 4.8, Sonnet 5, Fable 5, Mythos 5, or later versions of those families unless you opt in:
2846
2847 * `TodoWrite`
2848 * `TaskCreate`
2849 * `TaskGet`
2850 * `TaskUpdate`
2851 * `TaskList`
2852
2853 On other models, Claude Code provides the Task tools by default and `TodoWrite` only when you set `CLAUDE_CODE_ENABLE_TASKS=0`.
2854
2855 See [Model availability](/docs/en/agent-sdk/todo-tracking#model-availability) to opt in and [Migrate to Task tools](/docs/en/agent-sdk/todo-tracking#migrate-to-task-tools) to update your monitoring code.
28462856</Note>
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28482858**Input:**
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